想得到无旋转角度的拼接形状，则第一个选中的对象必需是水平的，因此形状组合时我们才要先选中叶子再选中其它形状。

Want no shape, the joining together of rotation Angle is the first selected object must be horizontal, so shape combination when we first select leaves and selected other shapes.

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每个弯曲采用Cobb角、顶点水平、顶椎旋转和最大曲度平面(PMC)旋转角度进行定量分析(8个变量)。

Each curve was quantified by its Cobb Angle, apex level, apex vertebra rotation, and rotation of the plane of maximum curvature (PMC) (8 variables).

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